Extendible eraser



Nov. 28, 1950 J. J. RoBBlNs 2,532,037

EXTENDIBLE ERASER Filed Nov. l0, 1945 4614 44424 za 30 45 j] E0 E 58Patented Nov. 2s, 1195o U'NlTED PATENT ortica` EXTN'DIBLE ER'ASR.

Jesse J. Robbins, Glendale, Gali., assigner to y Stylofede CorporatiomGlendale, Calif., a corporation. of California Application November 10,1945, SerialNo. 627328 My invention relates to erasers and more parrticularly tothat class of erasers adapted for at: tachment to automaticpencils.

Heretofore erasers attached to automatic pencils either extend normallyfrom. the.- end ofthe pencil opposite thepoint or are enclosed withinthe said pencil. In the one case. the eraser is exposed to dirt, wear,and the like when not in use; and. in the othercase. it is necessary toremove the cap from the pencil before theeraser may be used,`causing.inconvenienceand possible misplacing ofthe said cap. Anotherineen-- venience of the conventional type eraser-attachmentlies in thefacttthat4 when theeraser is new, its use inferasing subjects therubber-to extreme bending moments due to the distance between eraser tipand. eraser support. Frequently, this occasions breaking of the eraser.

It is my object to provide .an eraser attachable to an automatic pencilwhich is adaptedto eX- o tend from the end of the saidpe'ncil oppositethe pencil point and which may be withdrawn oreXtended from said pencilat-the users wish.

Another object of my invention is to provide support for the said erasermidway between the eraser tip and the eraser support; in such mannerthat when the eraser is new, the,A bendingl moment upon theeraser whenused is no more than the bending moment would .be itheferaserwere oldand .worn down.

A further object of my invention is toprovida an extendable eraserconstructionioffthe.character described wherein the eraser may beconveniently fed from anend of. a pencil aslit. isL worn awax,r in use,and wherein` a new eraserimay be.- quickly and easily. inserted whendesired.

Another object of my inventionis to provide my extendable eraserattachment of simple, com.- pact construction of a minimum of parts.

Other objects and advantages of this invention, it is believed, will beyapparent from thefollowing detailed descriptionv` thereof as illustratedinthe accompanying drawings.

In the drawings:

Figure I shows a side view of "anmautomatic, pencil having my extendibleeraser` extendingv therefrom.

Figure 2 shows a longitudinal cross sectiono,

taken substantially along the line 3'-3 oi-Figure; 2, but with.Aportions ot the interolxmechanismshownlin elevation.

Figure. 4 shows a cross-l section] or my: invention takenon the linelll-4; of Fig-ure 2:

Figure 5 show'sra. cross" seotionfoty my invention taken on the line` 55. of Figure. 3-..

Figure 6 is a:v perspective View.l offaf screw ele'- ment forming partlof the present construction;

Figure 7 shows in perspective the eraserlrubber andfsupportingmember.

Theextendible eraser construction-lofi the presa ent invention consists,briey, inthe combination with a tubular'pencil body. le: having aA boreH: opening to an` outer end l2 thereof," of a hollow nut' I8` journalledfor rotation aty the body end l2A and'V havingan.internally;tlfireadediopening I9 aligned withy the bore Il; a tubularcapmember- 28 secured to thev nut |81 for rotation therewith and havingaibore29 through: the lengthl off the cap member aligned with the borevIl andopen'- ing I9; a screw element threadablyengaged with the nut I8and mounted. for longitudinal reciprocation.- inthe aligned-boresl Iland 2910i the body and cap; meenam; inthebore H1 in slidable-=engagement; with the inner extremity 1 ofi the screw element. 38.1. forrestraining Athe latten against rotation relative to: the body? andV an'eraserf32 mounted for reciprocation in the cap bore 29 for extensionfrom the vouteropen end:30 thereof and detachably secured to :the screwelement.- 38 for longitudinal displacementltherebyi upon rotationrof thenut I8 andthe cap 28;

Anysuitable means may beiusednfor rotatably4 supporting thenut. laat theouter end. l2. As here shown, the end l2'of the bodyis 4off'reduced.diameter vandzexternally Vthreaded for receipt of `a surrounding,internally threaded collar `or ferrule I4 which likewisesurrounds theperiphery of al shoulder 22:011 the nut'lZ. As .will be noted 'fromFigures 2 'and 3;; the. outside diameter 20. of the nut shoulder;l isthexsameA as `the diameter otv the.A

reduced endv |2.ofthe body,y andthe innerl face. ofthe nut directlyabu-ts. and is slidable upon the ofthe. cap-at such endvbeing;substantially equal to the outside diameter 24 of thenutib'odythere at, .so as to;.provide a tightt joining` the cap and theinut`for=comrnon rotation.: In this man ner, the nut liis journalled bythefferrule-Ill for free rotationroi the nut relative to the "pencilbody` g Ill;` and ith'e tightrtfo'fvfthe cap 2llllup0nthenutL ablyengaged in the nut I8 medially of the length.

of the element, with its opposite ends extending into the aligned bodyand cap bores II and 29. As hereinabove noted, means 42 is provided inthe bore II for restraining the screw element against relative rotationwith respect to the body I0, so that upon appropriate rotation of thenutv I8 the screw element will be displaced longitudinally of the boresII and 29. may be of any convenient form and as here shown consists of aU-shaped member having dat, elongated parallel legs 43 and 45 fixed attheir free inner ends to a transverse wall 44 provided by the body I0across the interior of the bore I I and extending into the space betweenthe legs 39 and 4I of the screw member to restrain the latter againstrotation relative to the body I0.

The length of the screw element 38 and more specifically the toothedlegs 39 and 4I thereof is such as to permit the extension of the end 43of the element outwardly through the cap bore 29 to the exterior of thecap outside of the cap opening 30. Preferably, some suitable means isprovided for limiting the outward extension of the screw element and inthe present instance such meansis afforded by lugs i6 which are struckout from the legs 39 and 4I adjacent their inner ends and which onoutward extension of the screw will abut the inside face oi the nut toprevent further extension of the screw member.

The eraser 32 may be of conventional cylindrical form, of suitablerubber material for erasing purposes, having an external diameterenabling it to t within and be displaceable through the cap bore 29.Preferably, the latter is tapered toward the end 30 so that the boreaperture thereat tightly embraces the periphery of the eraser 32 so asto firmly support the eraser body at this point. The opposite end of theeraser is desirably embraced within a surrounding sheet metal housingsupport 34, which, in accordance with the present invention, is providedwith a pair of longitudinally extending clip or bracketv elements 36 ofhook shape which are engageable over the opposite sides of the fiat end43 of the screw element. The eraser may be most conveniently secured tothe end 43 of the screw element by displacing the latter exteriorly ofthe cap opening 3B and then sliding the clip elements 36 transverselyonto the opposite edges of the end 43, it being noted that the end issomewhat broader than the legs 39 and 4I so as to leave the oppositeedges of the end 43 free for receipt oi` ment 38 aords a resilientspacing of the opposed l legs 39 and 4I enabling the springing of theselegs toward each other for insertion in the nut I8. Advantage may alsobe taken of this resilient construction in effecting disassembly of themechanism for repair or replacement of theparts,

This means 42 Vembraced position on the screw.

I claim:

1. A device of the class described comprising: a housing having a boreopening to an end thereof; a ferrule threaded on said housing end; aninteriorly threaded nut rotatably carried by said ferrule in alignmentwith said bore; a tubular cap tightly tted at one end on said threadednut to rotate therewith in alignment with said bore and having an openopposite end; an eraser rubber mounted within said cap and extendiblethrough said outer open end thereof; a U-shaped screwmember carryingsaid eraser rubber and having spaced substantially parallel legs formedwith teeth threadably engaged with said threaded nut to extend orwithdraw said eraser rubber through said open cap end; and a membermounted within said housing and positioned between said legs to preventthe rotation of said screw member with respect to said housing.

2. An eraser supporting and displacing mechanism comprising, a casinghaving a bore opening to an end thereof, a nut member having aninternally threaded opening and being journalled for rotation relativeto said casing with said opening aligned with said bore, a tubular capdetachably secured to said member for rotation therewith and having aninterior bore aligned with said casing bore and member opening, aU-shaped screw member having a pair of spaced substantially parallellegs formed with teeth threadably engaged in said first member openingfor longitudinal reoiprocation in said bores, guide means provided insaid casing bore engageable with said legs and restraining said screwmember against rotation relative to said casing, the opposite end ofsaid screw member being positioned in said cap bore, and an erasermounted for reciprocation in said cap bore and detachably secured tosaid last-named end of said screw member.

3. An eraser supporting and displacing mechanism comprising, a casinghaving a bore opening to an end thereof, tubular means secured to saidcasing and journalled for relative rotation thereto and having aninternal bore aligned with said casing bore, a U-shaped member having apair of spaced substantially parallel legs and a connecting side mountedwithin said bores for longitudinal reciprocation of said member therein,thread means connecting said member and said first means for effectingsaid reciprocation upon rotation of said first means, guide means insaid casing bore engageable with said legs and restraining said memberagainst rotation relative to said casing, an eraser mounted forreciprocation in said bore in said means, and means detachably securingsaid eraser to said member side.

4. An eraser supporting and displacing mechanism comprising, a casinghaving a bore opening to an end thereof, tubular means journalled forrotation in said housing and having an internal bore aligned with saidrst bore, a screw element threadably engaged medially of its length insaid means bore, means restraining said screw element against rotationrelative to said casing thereby causing longitudinal reciprocation ofsaid element upon rotation of said rst means, one end of said elementextending into said bore of said iirst means and being formed with a atside positioned in a plane across said bore substantially perpendicularto the longitudinal aXis thereof, an eraser mounted for reciprocation insaid bore of said means, and a mounting member secured to said eraserand formed with a pair of end-Wise extending clip elements engageablewith said flat side of said element.

JESSE J. ROBBINS.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date Wahl Aug. 2, 1927 Page Apr. 23,1929 Smith July 4, 1939 Savoie Aug. 22, 1944

